Title :
Electronic noise properties of barium potassium bismuth oxide (BKBO) thin films
Author :
Lacoe, R.C. ; Gutierrez, D.A. ; Wendt, J.P. ; Hu, R. ; Burch, J.F. ; Lee, A.E.
Author_Institution :
Aerospace Corp., Los Angeles, CA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
The low-frequency electrical noise fluctuations in superconducting barium potassium bismuth oxide (BKBO) thin films deposited by magnetron sputtering and by laser ablation have been measured. The excess noise in the presence of a bias current was 1/f noise. The magnitudes of the room temperature 1/f noise were somewhat higher than observed in the best cuprate high-temperature superconducting thin films. The noise magnitude did not scale as expected with film geometry, and the noisier BKBO film also had the highest superconducting transition temperature. It is suggested that etch pits observed on the patterned films contributed to the total 1/f noise measured. Both films exhibit a peak in the noise voltage at the foot of the superconducting transition which cannot be explained from a model of 1/f noise resulting from temperature fluctuations.<>
Keywords :
barium compounds; fluctuations in superconductors; high-temperature superconductors; potassium compounds; pulsed laser deposition; random noise; sputtered coatings; superconducting thin films; superconducting transition temperature; 1/f noise; Ba-K-Bi-O; Ba/sub 0.6/K/sub 0.4/BiO/sub 3/; Ba/sub 0.6/K/sub 0.8/BiO/sub 3/; HTSC; Hooge coefficient; bias current; electronic noise properties; etch pits; excess noise; laser ablation; low-frequency electrical noise fluctuations; magnetron sputtering; patterned films; superconducting transition temperature; temperature fluctuations; Barium; Bismuth; Fluctuations; High temperature superconductors; Low-frequency noise; Sputtering; Superconducting device noise; Superconducting films; Superconducting thin films; Superconducting transition temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
